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Thansk for reporting bugs, but this one does not appear to be in Ubuntu. The newfs_hfs command is not part of the hfsprogs package, and actually I don't think you can find it in Ubuntu packages: it's from Apple's HFS+. So the bug is not from Ubuntu, I close it.

As a sidenote, it seems pdisk is not shipped by Ubuntu nor by Debian. So the needed tool would be pmac-fdisk (hope this helps).